I don't have my T1 yet, but I'm really interested in being able to do this. What does this part mean? Where do I add this? That code says something about sdcard, does that matter in any way?
Maybe my questions are really stupid and this would be obvious if I had the T1 in my hand, but I have a feeling I'm going to need more instructions even then.

I don't have my T1 yet, but I'm really interested in being able to do this. What does this part mean? Where do I add this? That code says something about sdcard, does that matter in any way?
Maybe my questions are really stupid and this would be obvious if I had the T1 in my hand, but I have a feeling I'm going to need more instructions even then.

If this is something you have been used to doing on your earlier Sony models it just means that where you used to add @font-face statements to the epub css files like:

Why would you want to do something like this? I know it takes a bit more space, but if you're going to edit the epub, why not just embed the fonts properly?

Another reason is that if you're creating your epubs with Calibre you can copy all the necessary @font-faces into the Look&Feel - ExtraCSS box in Preferences and they will all be automatically placed into the epub as part of the conversion to epub process. Fully embedding the fonts is still a manual process.

Good news.
Un-rooted T1 now can use customized fonts. Got the method from a Chinese forum.
Put the customized font file in the location fonts/ in internal flash.
Add the font path in epub : res:///ebook/fonts/../../mnt/sdcard/fonts/font.ttf
Now it works to use the user's font.

The Reader application probably either reject /mnt directory references or only accept references to /ebook/fonts but the ../../ counteract that restriction

Open the epub with an unzip utility (e.g. 7zip, WinRAR, Calibre Tweak epub)

Find the .css file and edit it in your favourite text editor. Copy all the @font-face statements to the top of the file (but after the css header, if there is one)

Replace the .css file in the epub and you're done.

so i've tried it both ways and still can't get it to work.

1. downloaded Caecilia font. renamed it myfont.ttf and placed it in new font folder in same directory as Books & DCIM

2. tried epub > epub conversion in Calibre. copy and pasted the code provided by jackie_w into the ExtraCSS box. transferred new epub file to reader, but it didn't work. i was able to open the epub file, but the font was not caecilia

3. also tried to edit using 7zip. i made sure the edited file was saved. transferred to kindle and got same result.

is this what the code is should look like? i pasted it to the beginning like instructed. please advise